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Fair Value Measurements of Plan Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets $ 168,651 $ 154,801 $ 422,255
Fixed Income Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Period of Notice Required to Redeem Investments 1 day    
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage 90.00%    
Fixed Income Securities - Russell 14-Year LDI Fixed Income Fund [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Term of Fund 14 years 14 years  
Fixed Income Securities - Russell 8-Year LDI Fixed Income Fund [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Term of Fund 8 years    
Fixed Income Securities - Russell STRIPS Fixed Income Funds - Ten Years [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Term of Fund 10 years    
Fixed Income Securities - Russell STRIPS Fixed Income Funds - Fifteen Years [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Term of Fund 15 years    
Fixed Income Securities - Russell STRIPS Fixed Income Funds - Twenty-Eight Years [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Term of Fund 28 years    
Multi-Asset Class Fund [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage 10.00%    
Multi-Asset Class Fund - Global Equity [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage 75.00%    
Multi-Asset Class Fund - Marketable Real Assets [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage 15.00%    
Multi-Asset Class Fund - Global Fixed Income [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage 10.00%    
Receivables and Accruals Net [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets $ (240) $ 440  
Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Period of Notice Required to Redeem Investments 1 day    
Fair Value, Inputs, Level 1, 2 and 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets $ 168,891 154,361  
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Fixed Income Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets [1] 152,530 141,930  
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Multi-Asset Class Fund [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets [2] 16,361 12,431  
Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0 0  
Level 1 [Member] | Fixed Income Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets [1] 0 0  
Level 1 [Member] | Multi-Asset Class Fund [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets [2] 0 0  
Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 168,891 154,361  
Level 2 [Member] | Fixed Income Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets [1],[3] 152,530 141,930  
Level 2 [Member] | Multi-Asset Class Fund [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets [2],[3] 16,361 12,431  
Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets 0 0  
Level 3 [Member] | Fixed Income Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets [1] 0 0  
Level 3 [Member] | Multi-Asset Class Fund [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan fair value of plan assets [2] $ 0 $ 0  
[1]
Invested in the Russell Long Duration Fixed Income Fund at December 31, 2019 and 2018, which is designed to provide current income and capital appreciation through diversified strategies including sector rotation, modest interest rate timing, security selection, and tactical use of high-yield, emerging market bonds and other non-index securities. In addition, at December 31, 2019 and 2018, our investments in this category included the Russell 14 Year LDI Fixed Income Fund. We also were invested in the Russell 8 Year LDI Fixed Income Fund at December 31, 2019. These LDI funds invest primarily in investment grade bonds that closely match those found in discount rate curves used to value U.S. pension liabilities and seeks to provide additional incremental return through modest interest rate timing, security selection, and tactical use of non-credit sectors. In addition, at December 31, 2019 and 2018, our investments in this category included Russell STRIPS Fixed Income Funds with duration profiles of 10, 15, and 28 years. These funds invest in a subset of the STRIPS universe with a similar duration profile as their respective Bloomberg Barclays U.S. STRIPS Index.
[2]
Invested in the Russell Multi-Asset Core Plus Fund, which is designed to provide long-term growth by providing a diversified portfolio of investments that has an overall strategic allocation of 75% global equity, 15% marketable real assets, and 10% global fixed income.
[3]
Securities represent common collective trusts managed and valued by Russell Trust Company, the administrator of the funds. While the underlying assets are actively traded on an exchange, the funds are not. The investments in equity and fixed-income securities are considered to have a readily determinable fair value because the fair value per share (unit) is determined and published and is the basis for current transactions. We have the ability to redeem these securities with a 1 day notice.